/*
 * Copyright (c) 2001,2002,2003 Mike Matsnev.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Absolutely no warranty of function or purpose is made by the author
 *    Mike Matsnev.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * $Id: RFile.h,v 1.11.2.4 2005/06/18 16:29:27 mike Exp $
 * 
 */

#if !defined(AFX_RFILE_H__3965961A_8172_4D80_990B_CC46A6EE9D62__INCLUDED_)
#define AFX_RFILE_H__3965961A_8172_4D80_990B_CC46A6EE9D62__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

// block oriented file i/o
class RFile  
{
public:
  static int  BSZ,BMASK; // block size, must be a power of two

  RFile(const CString& filename) : m_fh(INVALID_HANDLE_VALUE),
    m_fn(filename), m_didreopen(false), m_diderror(false),
    m_ptr(0) { }
  virtual ~RFile() {
    if (m_fh != INVALID_HANDLE_VALUE)
      CloseHandle(m_fh);
  }

  // generic file operations
  virtual DWORD	  size();
  virtual DWORD	  read(void *buf);
  virtual void	  seek(DWORD pos);

  // compression
  virtual CString CompressionInfo() { return _T("None"); }

  // buffer size setting
  static void	  InitBufSize();

  // RFile helpers
  bool		  Reopen();
  void		  ShowError();
  DWORD		  read2(void *buf,DWORD size);

protected:
  HANDLE	  m_fh;
  CString	  m_fn;
  DWORD		  m_ptr;

  bool		  m_didreopen;
  bool		  m_diderror;

  void		  seek2(DWORD where,DWORD how);
  DWORD		  pos();
};

// I/O error messages
CString	FileExceptionInfo(const CString& filename,DWORD dwError);
CString FileName(const CString& file);

#endif // !defined(AFX_RFILE_H__3965961A_8172_4D80_990B_CC46A6EE9D62__INCLUDED_)
